Nanoparticulate precursor route to fine particles of TaON and ZrO2-TaON solid solution and their photocatalytic activity for hydrogen evolution under visible light
Nanoparticulate precursor route to fine particles of TaON and ZrO2-TaON solid solution and their photocatalytic activity for hydrogen evolution under visible light
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DOI：
10.1016/j.apcata.2009.01.024
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发表时间：
2009-04-15
影响因子：
5.5
通讯作者：
Domen, Kazunari
中科院分区：
文献类型：
--
作者：
Maeda, Kazuhiko;Terashima, Hiroaki;Domen, Kazunari
尝试制备细小的 TaON 颗粒以提高可见光（λ > 420 nm）下从甲醇水溶液中析出 H-2 的光催化活性。 TaON 是通过在 NH3 流下将 Ta2O5 粉末在 1123 K 下氮化 15 小时来合成的。当使用初级颗粒尺寸为30-50 nm的纳米颗粒Ta2O5作为前驱体时，获得尺寸为50-80 nm的TaON细颗粒(FP-TaON)，但初级颗粒聚集形成更大的次级颗粒。 Zr-Ta混合氧化物（Zr/Ta=0.1）纳米粒子的氮化导致产生单斜ZrO2和TaON的固溶体，其初级粒径为30-50 nm，与FP-TaON相比，聚集更少且活性更高。事实证明，抑制从 Ta2O5 氮化到 TaON 过程中产生的表面缺陷（钽物质减少）对于使用 TaON 基光催化剂实现高效 H-2 析出至关重要。 (C) 2009 Elsevier B.V. 保留所有权利。
Preparation of fine TaON particles is attempted to improve the photocatalytic activity for H-2 evolution from aqueous methanol solution under visible light (lambda > 420 nm). TaON is synthesized by nitriding Ta2O5 powder at 1123 K for 15 h under a flow of NH3. When nanoparticulate Ta2O5 with a primary particle size of 30-50 nm is used as the precursor, fine particles of TaON (FP-TaON) with 50-80 nm in size is obtained, but the primary particles aggregate to form larger secondary particles. Nitridation of Zr-Ta mixed oxide (Zr/Ta=0.1) nanoparticles results in the production of a solid solution of monoclinic-ZrO2 and TaON exhibiting 30-50 nm primary particle size with less aggregation and higher activity, as compared to FP-TaON. Suppression of surface defects (reduced tantalum species) produced during nitridation from Ta2O5 to TaON is shown to be essential for achieving efficient H-2 evolution using TaON-based photocatalysts. (C) 2009 Elsevier B.V. All rights reserved.